Struct Read

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pub struct Read<'a, T: 'a, F = DefaultProvider> { /* private fields */ }

Expand description

Allows to fetch a resource in a system immutably.

If the resource isn’t strictly required, you should use Option<Read<T>>.

§Type parameters

T: The type of the resource
F: The setup handler (default: DefaultProvider)

Trait Implementations§

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impl<'a, T, F> Deref for Read<'a, T, F>
where T: Resource,

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type Target = T

The resulting type after dereferencing.

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fn deref(&self) -> &T

Dereferences the value.

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impl<'a, T, F> From<Fetch<'a, T>> for Read<'a, T, F>

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fn from(inner: Fetch<'a, T>) -> Self

Converts to this type from the input type.

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impl<'a, T, F> SystemData<'a> for Read<'a, T, F>
where T: Resource, F: SetupHandler<T>,

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fn setup(world: &mut World)

Sets up the system data for fetching it from the World.

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fn fetch(world: &'a World) -> Self

Fetches the system data from World. Note that this is only specified for one concrete lifetime 'a, you need to implement the SystemData trait for every possible lifetime.

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fn reads() -> Vec<ResourceId>

Returns all read dependencies as fetched from Self::fetch. Read more

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fn writes() -> Vec<ResourceId>

Returns all write dependencies as fetched from Self::fetch. Read more

Auto Trait Implementations§

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impl<'a, T, F = DefaultProvider> !UnwindSafe for Read<'a, T, F>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<'a, T> DynamicSystemData<'a> for T
where T: SystemData<'a>,

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type Accessor = StaticAccessor<T>

The accessor of the SystemData, which specifies the read and write dependencies and does the fetching.

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fn setup(_: &StaticAccessor<T>, world: &mut World)

Sets up World for fetching this system data.

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fn fetch(_: &StaticAccessor<T>, world: &'a World) -> T

Creates a new resource bundle by fetching the required resources from the World struct. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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